Low Blood Pressure: Low blood pressure (hypotension) may be caused by
- heart conditions,
- intravascular fluid complications (dehydration, pneumonia, vomiting, diarrhea, bleeding),
- endocrine conditions,
- allergic reactions,
- orthostatic hypotension,
- diabetes, and
- micturition syncope.
Severe Allergic Reaction (Anaphylactic Shock) The severe reaction of anaphylaxis is an immune allergic response that is life-threatening. The symptoms are breathing problems, shock, or death. Reactions may result from an insect sting or certain foods to which the body has been "sensitized" and has developed a powerful antigen for. Anaphylaxis occurs when the imune system overreacts to the antigen.